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May Weather in Jefferson, United States

Last updated: June 24, 2025

In Jefferson, United States, the average temperature in May is a mild 16°C (61°F). However, be prepared for a range, as temperatures can dip to a chilly -2°C (29°F) or soar up to a warm 28°C (82°F). You'll likely encounter some rainy days, with about 140 mm (5.5 in) of precipitation falling over 16 days. Don't forget to check the forecasts, as the average humidity sits at a sticky 83%!

May Temperature in Jefferson

In May in Jefferson, the average temperature is 16°C (61°F). Maximum temperatures can reach 28°C (82°F), while minimums can drop as low as -2°C (29°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

May Weather in Jefferson: Daily Temperature Highs, Lows, and Averages

The chart illustrates May temperature patterns in Jefferson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Jefferson, May typically has an average temperature of 16°C (61°F), with highs reaching up to 28°C (82°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec344044526066706864564238
Data source: Temperature data for Jefferson generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

May Precipitation in Jefferson

In Jefferson in May, the total precipitation amount is 140 mm (5.5 in) spread over 16 days.

May Precipitation Trends in Jefferson

The chart displays monthly precipitation patterns in Jefferson, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Jefferson, May typically receives around 140 mm (5.5 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec8812911214314013210313312613076107
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Jefferson

In Jefferson in May, humidity is 83%. With an average temperature of 16°C (61°F), this humidity feels like a warm, muggy blanket wrapping around you, making travel a bit sticky and potentially uncomfortable as you navigate through the sights.

May Average Humidity in Jefferson

This chart illustrates the average monthly humidity levels in Jefferson, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Jefferson is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%86%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Jefferson

In Jefferson in May, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Jefferson.

Maximum UV Index Levels in Jefferson for May

The chart shows the monthly maximum UV Index (UVI) for Jefferson in May, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In May, the maximum UV index in Jefferson typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468111111111110863
Data source: Jefferson May UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How May Weather in Jefferson Compares to Other Months

Weather in Jefferson varies notably across the year, with each month offering distinct climate conditions. This page compares May’s weather to other months in Jefferson, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Jefferson, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)88 mm (3.5 inches)87%moderate
February Weather4°C (40°F)129 mm (5.1 inches)87%high
March Weather7°C (44°F)112 mm (4.4 inches)86%very high
April Weather11°C (52°F)143 mm (5.6 inches)84%extreme
May Weather16°C (61°F)140 mm (5.5 inches)83%extreme
June Weather19°C (66°F)132 mm (5.2 inches)83%extreme
July Weather21°C (70°F)103 mm (4.0 inches)79%extreme
August Weather20°C (69°F)133 mm (5.2 inches)66%extreme
September Weather18°C (65°F)126 mm (5.0 inches)68%very high
October Weather13°C (56°F)130 mm (5.1 inches)78%very high
November Weather6°C (42°F)76 mm (3.0 inches)89%high
December Weather3°C (38°F)107 mm (4.2 inches)86%moderate

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